I accidentally navigated to one of those sites that pops up a dialog telling me that my computer is infected. Upon clicking the OK button, that dialog reappears, ad infinitum.
I cannot close the tab or otherwise interact with Safari while the dialog is up. No matter how many times I Quit or Force Quit (and no matter how many times I tell Safari "Do Not Re-open Windows") the previously-open set of tabs always reopens and this dialog pops to the fore.
How can I delete the state of things while Safari is closed?
Best Answer
From http://seanscus.blogspot.com/2012/08/completely-reset-safari.html
Open a terminal and enter the following commands to fully wipe out all of your old Safari settings:
mv ~/Library/Safari ~/Desktop/Safari-`date +%Y%m%d%H%M%S`; \ rm -Rf ~/Library/Caches/Apple\ -\ Safari\ -\ Safari\ Extensions\ Gallery; \ rm -Rf ~/Library/Caches/Metadata/Safari; \ rm -Rf ~/Library/Caches/com.apple.Safari; \ rm -Rf ~/Library/Caches/com.apple.WebKit.PluginProcess; \ rm -Rf ~/Library/Cookies/Cookies.binarycookies; \ rm -Rf ~/Library/Preferences/Apple\ -\ Safari\ -\ Safari\ Extensions\ Gallery; \ rm -Rf ~/Library/Preferences/com.apple.Safari.LSSharedFileList.plist; \ rm -Rf ~/Library/Preferences/com.apple.Safari.RSS.plist; \ rm -Rf ~/Library/Preferences/com.apple.Safari.plist; \ rm -Rf ~/Library/Preferences/com.apple.WebFoundation.plist; \ rm -Rf ~/Library/Preferences/com.apple.WebKit.PluginHost.plist; \ rm -Rf ~/Library/Preferences/com.apple.WebKit.PluginProcess.plist; \ rm -Rf ~/Library/PubSub/Database; \ rm -Rf ~/Library/Saved\ Application\ State/com.apple.Safari.savedState